1 November 2025
Petcu, G., Anghel, E., Atkinson, I., Papa, F., Apostol, N. G., Baran, A., Petrscu, S., Trica, B., Tenchev, K., Todorova, S., Parvulescu, V..
(
Красимир Тенчев;
Силвия Тодорова;
)
Abstract
Two series of photocatalysts (TYAu, TYCeAu) were obtained. Ti was incorporated by direct synthesis with zeolite Y, while Ce and Au were immobilized by double incipient wetness impregnation method. The experimental weight percents (XRF analysis) were for titanium (0.7?%, 1.9?%, 3.5?%), Ce (1?%), and Au (0.3?%, 0.1 %). The typical crystalline structure of zeolite Y was preserved in all samples except those with 3.5?% Ti, where XRD revealed reduced pattern intensity. SEM and TEM analyses showed morphological changes at higher Ti contents. CO?-TPD confirmed a decrease in basicity with increasing Ti, consistent with the diminished zeolite contribution. XPS analysis indicated the presence of varying Au0/Au? and Ce?+/Ce4+ ratios on the surface, depending on the Ti content. The intra- and extraframework TiO2 as amorphous or anatase phases were Raman confirmed in cerium-containing samples. For materials with high Ti content, the dominant effect was from the Ce and Ti species, accentuated by gold. The surface plasmon resonance effect of Au nanoparticles and decreasing in band gap energy after Ce immobilization was evidenced by UV-Vis spectroscopy. The photocatalytic properties of the synthesized materials were evaluated in CO2 reduction with water and H2 production via water splitting under visible light (525?nm). Higher Ti content enhanced CO2 conversion and reduced CH4 selectivity, favoring the production of CH3OH and CH2O. A greater amount of hydrogen was produced by the samples with the lowest Ti concentration while the reaction was favored by the presence of cerium in the rich titanium samples.
Catalysis Today, 459, Elsevier, 2025, ISSN:0920-5861, DOI:doi.org/10.1016/j.cattod.2025.115403, JCR-IF (Web of Science):5.2 Q1, не оглавява ранглистата (Web of Science)
https://doi.org/10.1016/j.cattod.2025.115403
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